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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e00753be775de06df31ecccaf40ab08c11b6e4834aebc6d2ffb49faddc1e05bc' 
  AND token = 'FhFWixDACmbtITBt5il7jZ+VJ46eO9KOmNSZkONQuqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}